diff --git a/NEWS b/NEWS
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,9 @@
+v0.10	2021-02-19	lazy text
+
+Read input twice with Text.Lazy (thanks to David Hewson).
+Allows processing huge input, speeds up less huge input too.
+
+
 v0.9	2018-08-01	detach
 
 New flags and features:
diff --git a/hp2pretty.cabal b/hp2pretty.cabal
--- a/hp2pretty.cabal
+++ b/hp2pretty.cabal
@@ -1,5 +1,5 @@
 Name:                hp2pretty
-Version:             0.10
+Version:             0.10.1
 Synopsis:            generate pretty graphs from heap profiles
 Description:         hp2pretty is a rewrite of hp2ps, implemented in Haskell, with
                      the aims of being maintainable, with more flexible output, and
@@ -114,4 +114,4 @@
 Source-repository this
   type:                git
   location:            https://code.mathr.co.uk/hp2pretty.git
-  tag:                 v0.10
+  tag:                 v0.10.1
diff --git a/src/Graphics.hs b/src/Graphics.hs
--- a/src/Graphics.hs
+++ b/src/Graphics.hs
@@ -1,6 +1,7 @@
 module Graphics where
 
-import Data.Text.Lazy (Text, foldl')
+import Data.Text.Lazy (Text)
+import qualified Data.Text.Lazy as TL (foldl')
 import Data.Char (ord)
 import Data.Bits (shiftR)
 import Data.Int (Int32, Int64)
@@ -73,7 +74,7 @@
 -- base-4.3.1.0:Data.HashTable (c) The University of Glasgow 2003
 
 hashText :: Int32 -> Text -> Int32
-hashText magic = foldl' f golden
+hashText magic = TL.foldl' f golden
   where f m c = fromIntegral (ord c) * magic + hashInt32 m
 
 hashInt32 :: Int32 -> Int32